Simple. Just return to the main auction page that you made an offer on. Next, scroll down to the “Buy NFTs” section. Here, you’ll see a filter labeled “Offers Made.” When you click on this filter, all of your offers on this particular NFT will appear.
If you have trouble finding the page from which you made your initial offer, check your email for an email confirmation of your offer. In this email will be a link that will send you directly to the Manage Offer page.